38C3 datasheet(87/224 Pages) RENESAS

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2-22

38C3 Group User’s Manual

APPLICATION

2.2 Timer

Fig. 2.2.18 Control procedure

RESET

SEI

T12M

T34M

IREQ1

ICON1

T12M

CLI

000000012

00XX01X02

000XXXXX2

001XXXXX2

3F16

FF16

0F16

IREQ1

FF16

0F16

(address 2116)

(address 2216)

(address 3C16), bit7

(address 2816)

(address 2916)

(address 3C16)

(address 3E16)

(address 2016)

(address 2116)

(address 2216)

(address 2816), bit0

Clock is stopped ?

IREQ1 (address 3C16), bit7 ?

Initialization

•All interrupts disabled

•Timer count start

•Interrupts enabled

q X: This bit is not used here. Set it to “0” or “1” arbitrarily.

•Connection of Timers 1 to 3

•Setting of Interrupt request bits of Timers 1 to 3 to “0”

•Timer 1 interrupt enabled, Timers 2 and 3 interrupts disabled

•Setting “Division ratio – 1” to Timers 1 to 3

IREQ1 (address 3C16), bit7

Clock count up

Second to Year

Main processing

•Judgment whether time is not set or time is being set

•Confirmation that 1 sec. has passed

(Check of Timer 3 interrupt request bit)

•Interrupt request bit cleared

(Clear it by software when not using the interrupt.)

•Clock count up

•Adjust the main processing so that all processing in the loop V will

be processed within 1 second period.

•Set Timers again when starting clock from 0 second after

end of clock setting.

The procedure is Timer 2 setting followed by Timer 3 setting.

•Do not set Timer 1 again because Timer 1 is used to

generate the interrupt at 244

µs intervals.

Note : Perform procedure for end of clock setting only when end of

clock setting.

<Procedure for end of clock setting> (Note)

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